please simply explain the takeover details, page-2

Treat the dividend as a normal dividend (fully franked) and so is assessable in the 11/12 year.
The $2.68 is a capital reduction which is subtracted from your purchase price. So if you bought the GCL shares for $7.00, then your cost base will reduce by $2.68, i.e. your new 'cost' for the relevant shares for tax purposes (when you come to sell them in the future) is $7 minus $2.68, i.e. $4.32.
YAL is the new share you own. YALN is the 'CVR' as they called it-the guarantee of up to $3 if YAL is below $6.96 in 18 months time. I'm not sure whether the cost base of the GCL is split between YAL and YALN or whether it goes totally into YAL.